Well, there is this article with Robert Carlyle https://www.theguardian.com/film/2017/jan/08/t2-trainspotting-robert-carlyle-begbie-interview?CMP=twt_gu where he said: “I’m at the stage where even though Britain is in a mess politically, I think it’s time to pack up and come home.” So I think that means that he is pretty much done with OUAT and that season 6 is his final season.
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